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Santosh Kr. Tiwari,Goutam Hatui,Ramesh Oraon,Amrita De Adhikari,Ganesh Chandra Nayak 한국물리학회 2017 Current Applied Physics Vol.17 No.9
Herein, we report an efficient approach for the fabrication of polymer blend nanocomposites with welldispersed graphene oxide in polycarbonate (PC)/poly methyl methacrylate (PMMA) through melt compounding under the controlled temperature and pressure. Graphene oxide was synthesized by Improved Hummer's method and consequently dispersed in PC and PMMA through different mixing sequences to access their dispersion in the blend nanocomposites. Thermo-mechanical investigations indicate ~119.4% increase in tensile strength, ~64.87% increase in the Young's modulus and ~16.3% increase in glass transition value for the sample prepared by mixing GO first with PMMA and then with PC, in comparison to neat blend. This reinforcement in thermo-mechanical properties of sample prepared by mixing GO first with PMMA and then with PC, on incorporation of 1% of graphene oxide (by weight) is due to the effective interfacial adhesion and uniform load transfer at the interfaces of polymer blend nanocomposites. Furthermore, Thermogravimetric analysis showed a remarkable decrease in weight loss at elevated temperature for the nanocomposites, which confirms the role of graphene oxide on thermal stability of PNCs. The fabricated blend nanocomposites are ecofriendly, cost effective and can be used for various industrial applications where elevated temperature is required.
Adhikari, Amrita De,Oraon, Ramesh,Tiwari, Santosh Kumar,Saren, Pupulata,Lee, Joong Hee,Kim, Nam Hoon,Nayak, Ganesh Chandra American Chemical Society 2018 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.57 No.5
<P>CoFe<SUB>2</SUB>O<SUB>4</SUB> nanospheres ornamented CdS nanorods were successfully assembled over the reduced graphene oxide nanosheets. Such hierarchical morphology established by field emission scanning electron microscopy and transmission electron microscopy studies, with high surface area offered a high specific capacitance of 1487 F g<SUP>–1</SUP> at a current density of 5 A g<SUP>–1</SUP> owing to fast diffusion of ions, facile transportation of electrons, and great synergism between the components, which led to reversible redox reactions. Furthermore, the electrode material has specific capacitance retention of 78% up to 5000 cycles, thus demonstrating its good reversibility and cyclic stability. The resulting CdS-CoFe<SUB>2</SUB>O<SUB>4</SUB>@reduced graphene oxide nanohybrid can deliver excellent electrochemical performance and can be a potential candidate for supercapacitor application.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2018/iecred.2018.57.issue-5/acs.iecr.7b04885/production/images/medium/ie-2017-04885n_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie7b04885'>ACS Electronic Supporting Info</A></P>
T. Thuamthansanga,B. K. Sahoo,Ramesh Chandra Tiwari 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.1
The study investigates radon and thoron concentrations in soil and water at one of the most prominent faults in Mizoram state, India. The obtained isotope pair data were consequently used for estimating the uranium and thorium content of the region. An indigenously developed and calibrated ZnS(Ag) alpha based scintillation counter (Model: SMARTRnDuo, BARC, India) was deployed for assessing radon and thoron data. Thoron concentration was found to be higher than radon concentration in both soil and water. The isotope pair and their parent nuclei concentration in water were found to be higher than in soil. The uranium and thorium content in soil were estimated to be 17.5 and 22.6 Bqkg<SUP>-1</SUP> respectively, but in water, they were estimated to be 41.6 and 124.8 Bqkg<SUP>-1</SUP> respectively. Comparisons with global averages were also presented in detail and no radiological risk has been observed for the region. A continuous radon data was generated at Mizoram University, Aizawl, Mizoram (India) for cross-analysis with data at Mat fault. It was observed that radon data of the two locations behave similarly during geophysical phenomena, indicating that the region was seismically active. No geophysical properties of thoron were observed.
Estimation of 238U and 232Th in soil and water of prominent fault region of Mizoram
T. Thuamthansanga,B. K. Sahoo,Ramesh Chandra Tiwari 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.1
The study investigates radon and thoron concentrations in soil and water at one of the most prominent faults in Mizoram state, India. The obtained isotope pair data were consequently used for estimating the uranium and thorium content of the region. An indigenously developed and calibrated ZnS(Ag) alpha based scintillation counter (Model: SMARTRnDuo, BARC, India) was deployed for assessing radon and thoron data. Thoron concentration was found to be higher than radon concentration in both soil and water. The isotope pair and their parent nuclei concentration in water were found to be higher than in soil. The uranium and thorium content in soil were estimated to be 17.5 and 22.6 Bqkg−1 respectively, but in water, they were estimated to be 41.6 and 124.8 Bqkg−1 respectively. Comparisons with global averages were also presented in detail and no radiological risk has been observed for the region. A continuous radon data was generated at Mizoram University, Aizawl, Mizoram (India) for cross-analysis with data at Mat fault. It was observed that radon data of the two locations behave similarly during geophysical phenomena, indicating that the region was seismically active. No geophysical properties of thoron were observed.